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Because I'm trying to solve for the steady state of the variables but one of the eigenvalues is close to 0/0, I have been looking in the board for a way to reduce the qz_zero_threshold, but cannot find one. Is this the same as TolFun in dynare_solve.m ? Because I also changed it, and it is not working.

Best

See the manual on

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qz_zero_threshold

(http://www.dynare.org/manual/index_24.html#qz_005fzero_005fthreshold)

Note that this is often not a solution to the underlying problem as the singularity regularly comes from economic factors as opposed to pure numerical problems.